A significant portion of Suárez’s research focused on the thyroid gland. He identified hypothyroidism (an underactive thyroid) as a primary, often overlooked, driver of obesity. He critiqued the standard medical reliance on TSH (Thyroid Stimulating Hormone) levels as the sole diagnostic marker for thyroid health, arguing that many patients suffer from "subclinical" thyroid issues that go undiagnosed.
This is where Dr. Suarez became controversial. He often said that "healthy" eating is making us sick. He specifically warned against:
One of his most significant contributions was the distinction between the (Parasympathetic) and the Excited Nervous System (Sympathetic). He argued that "one man’s food is another man’s poison."
Frank Suárez’s impact is undeniable. He transformed the lives of people with Type 2 diabetes by showing them how to control their blood sugar through diet, often reducing their dependence on medication.